Hex key holder



FIG. 1 is a perspective view of a hex key holder showing my new design;

FIG. 2 is a front elevational view of my new design;

FIG. 3 is a top elevational view of my new design;

FIG. 4 is a side elevational view of my new design;

FIG. 5 is a rear elevational view of my new design; and,

FIG. 6 is a bottom plan view of my new design.

The broken line illustrations in the drawings, showing several types of hex keys positioned in the hex key holder, are not part of the design sought to be patented. 

The ornamental design for a hex key holder, as shown and described. 